Update README.md

README.md

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 # avrdude
 avrdude patches for USBASP as a PDI programmer
+
+Instructions:
+
+1. Download AVRDUDE from official sources
+   $ wget http://download.savannah.gnu.org/releases/avrdude/avrdude-6.3.tar.gz
+
+2. Extract downloade AVRDUDE
+   $ tar xvf avrdude-6.3.tar.gz
+
+2. change to avrdude directory
+   $ cd avrdude-6.3
+
+3. Apply patches
+   $ patch -i usbasp.c.diff
+   $ patch -i usbasp.h.diff
+   $ cp <path/to/xmega_pdi.h> .
+   $ ./bootstrap
+   $ ./configure
+   $ make
+
+To create a modified usbasp from a cheap usbasp china clone, look here http://szulat.blogspot.com/2012/08/atxmega-programmer-for-050.html